包括会计平台、基础数据、客户化、权限、条码、系统管理等共9册

6相异步电动机数学模型

Abstract —— This paper presents a mathematical model of a doubly fed induction generator (DFIG) in the positive synchronous reference frame under distorted grid voltage conditions. The oscillations of the DFIG’s electromagnetic torque and the instantaneous stator active and reactive powers are fully described when the grid voltage is harmonically distorted. Four alternative control targets are proposed to improve the system responses during grid harmonic distortions. A new rotor current control scheme implemented in the positive synchronous reference frame is developed. The control scheme consists of a proportional–integral (PI) regulator and a harmonic resonant (R) compensator tuned at six times the grid frequency. Consequently, the fundamental and the fifth- and seventh-order components of rotor currents are directly regulated by the PI–R controller without sequential-component decompositions. The feasibility of the proposed control strategy is validated by simulation studies on a 2.0-MW wind-turbine-driven DFIG system. Compared with the conventional vector control scheme based on standard PI current controllers, the proposed control scheme leads to significant elimination of either DFIG power or torque oscillations under distorted grid voltage conditions.

UML; 学生成绩管理系统; 静态建模; 动态建模

这是状态空间形式的三相感应电机动态 dq 模型的 Simulink 仿真。 给出了感应电机子模型构建的细节，并描述了它们在 SIMULINK 中的实现。 所需的方程在开头陈述，然后开发了感应电机的 dq 模型。 该模型可用于其他应用，例如设计可调速驱动器。 论文中给出了模型的完整方程： http://www.ijettjournal.org/2015/volume-24/number-5/IJETT-V24P245.pdf

摘要：利用状态空间平均法分析了ZVSPWMDC/DC变换器主电路并利用状态平均方程对其建立了动态模型，进行了仿真研究。仿真结果证明本方法和研究结果具有一定应用价值。关键词：移相全桥DC/DC变换器；建模；状态空间平均法图1FBZVSPWMDC/DC变换器主电路图2典型的Buck电路1引言移相全桥零电压开关电路是一种适用于大功率开关电源的软开关电路。它具有电路结构简单，易于实现恒频控制，易于高频化，不需辅助电路，铁磁元件容量小，变压器的漏感和开关器件的寄生电容可以纳入谐振电路，谐振软开关器件应力小，开关损耗小等优点。近年来，移相全桥ZVSPWMDC/DC变换主电路在DC/DC变换中应用十

离心泵动态建模在泵启动过程中的应用

NC65动态建模产品手册